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Unit Conversion
Part I: Length-Area-Volume
From The International System of Units   NASA SP-7012
Note: an asterisk (*) after a number indicates it is exact

Voume Units

To Convert From To Multiply By
gallon (U.S. liquid) Liters 3.785 411 784*
ounce (US fluid) cm3 29.57 352 956 25 *
inch3 cm3 16.38 706 4*
gallon (U.S. liquid) ounce (US fluid) 128*
foot3 m3 0.028 316 846 592*

Area Units

To Convert From To Multiply By
foot2 meter2 0.092 903 4*
inch2 centimeters2 6.4516*

Length Units

To Convert From To Multiply By
foot meter 0.3048*
inch centimeters 2.54*
mile (U.S. statute) kilometer 1.609344*
mile (nautical) kilometer 1.852*